Method for making molds for ornamental glassware.



0. A. MYGATT.

. METHOD FOR MAKING MOLDS FOR ORNAMENTAL GLASSWARE.

AFPLICATION FILED DEC.

Patented May 15,1917.

INVE/VTUH #44. A7TOR/VEY Ti :EL

UNITED STATES ra'rnnr orrion.

OTIS A.IVIYGATT, OF NEW YORK, N. Y., ASSIGNOR T0 I-IOLOIPHANE GLASS COMPANY, 0F

NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

METHOD FOR MAKING IVIOLDS FOR ORNAMENTAL GLASSWARE.

Original application filed July 1, 1909, Serial No. 505,438.

Specification of Letters Patent.

Patented May 15, 1917. Divided and this application filed December-6,

1915. Serial N 0. 65,204.

To all whom it may concern Be it known that I, Orrs A. MYGATT, a citizen of the United States, residing at New York city, New York, have invented certain new and useful Improvements in Methods for Making Molds for Ornamental Glassware, of which the following is a specification.

This application is a division of the application filed July 1, 1909, Serial Number 505438. for glass structure.

My invention consists in the preparation of a mold used in ornamentation of glassware in a' new mannerby which designs of various kinds are carried out in theglassware in sharp contrast to a background of fine parallel corrugations.

The invention is carried out by completely covering by mechanical means the mold sections (mold or plunger or both) with fine ribbings or grain-work surfaces, which may i be prismatic or otherwise, and then cuttlng or chipping away, preferably by hand, certain portions of the ribbed background thus formed to form decorative designs in the glassware. The invention is explained more fully below together with the addltlonal processes which help to make the finished glass article a decorative and beaut1ful object.

Figure 1 is a side elevation of a mold which is completely covered with fine ribbings.

Fig. 2 is a similar side elevation in which the design has been chipped away.

Fig. is a side elevation of a plunger covered with fine ribbings, and Fig. 4.- is the same plunger to which my method of ornamentation has been applied.

Fig. 5 is a side elevation of a globe produced by my method.

The entire surface of a mold or plunger or both is mechanically covered with homogeneous fine ribbings. These ribbings or lines may be horizontal or vertical or any net-work of ribbings may be chosen to simulate an engraved background. An effective form is a reproduction of cross-hatching. The backgroundis uniform throughout and serves much the same purpose as the uniform background of a picture. The predetermined design is then chipped away by Copies of this patent may be obtained for five cents each, by addressing the Commissioner of method produces a cameo hand or by machinery and the ribbings may be either entirely effaced or merely reduced in size.

In the figures m is a mold and p is a plunger used in the manufacture of molded glassarticles. The interior of the mold and exterlor of the plunger are completely covered with fine parallel ribs or corrugations g which produce in the finished glassware light modifying ribs, as shown at r in Fig. 5. These ribs in the mold section are cut or chipped. away by machinery or by hand to form transparent smooth designs :0.

The globe in Fig. 5 mayhave either the smooth or chipped portion further ornamented by acid etching, sand blasting, enameling or the like.

Glass ornamentation formed by this effect.

Hitherto when contrast of this sort was desired the backgroundof fine ribs was cut in the mold sections, leaving the design free, but this caused an expensive process. My method is the reverse. When glass is pressed in the mold, the ornamentation formed by the design cuttings .cc appear in sharp contrast to the even background y.

The plunger may be entirely smooth or else completely covered with corrugations, none of which have been removed. The ribbings may be prismatic, and where reflectors are desired the mold section may have radial prisms of degrees.

WVhat I claim and desire to secure by Letters Patent of the United States is:

1. The method of preparing a mold for the manufacture of ornamental glass articles which consists in covering the surface 90 of the mold with fine ribbings and then removing portions of the said ribbings so that there will be produced in the glass 2. design upon an evenly ribbed background.

2. The method of preparing a mold for the manufacture of ornamental glass shades which consists in covering the surfaceof the mold with fine ribbings and then cutting away portions of the said ribbings in ac cordance with a predetermined design.

OTIS A. MYGATT.

Witnesses:

Joni. B. LIBERMAN, MAX GRnnNs'rEiN.

Patents, 

